| ITEM | STANDARD |
| Purity,%?(dry?basis)? | 99.0-101.0? |
| Chloride（Cl）,%? | =<0.02? |
| Sulphates?（SO4）,%? | =<0.02%? |
| Loss?on?drying,%? | =<?1.0%? |
| Ignition?residue,%? | =<?1.0%? |
| Heavy?metals(Pb),% | =<0.002? |
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